JPS5921732A - Production of hard twisted special composite yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a highly twisted light-adjustable special composite yarn, and more specifically, a method for producing a highly twisted light-adjustable special composite yarn, in particular a method for supplying two or more thermoplastic multifit yarns at different yarn feeding speeds to an intermittent false twisting area. , and by adopting a special yarn feeding method in which the yarn feeding speed of the yarn with a higher yarn feeding speed is changed in accordance with the intermittent false twisting, the untwisted portion having a twist in the false twisting heating direction is The alternating twist formation effect is greatly enhanced by forming intertwisted parts having twists in the false-twisting and untwisting directions alternately in the longitudinal direction of the yarn.Furthermore, the winding form of the sheath yarn wound around the core yarn makes it possible to achieve It has a much higher crispness than the strong twist effect caused by strong twisting of the yarn.

The present invention relates to a method for producing a highly twisted light-adjustable special composite yarn that can provide strong twist effects such as weight, drapability, and elastic texture.

Conventionally, techniques for alternately forming untwisted portions and untwisted portions during false twisting are disclosed in Japanese Patent Publications No. 39-12891, Japanese Patent Publication No. 40-14615, and Japanese Patent Application Laid-open No. 49-8.
This method has been proposed in JP-A No. 414, JP-A No. 49-108353, JP-A No. 51-49949, JP-A No. 61745-Sho 53, and the like. These yarn twisting techniques utilize the transient phenomenon of twist propagation, and the length of the untwisted part and the twisted part varies from 1 to 2 depending on the yarn speed and the period of false twisting.
It is possible to form alternating hemp yarns that extend to t11 or more. However, all of these conventional techniques have a low twist density.

Except for those that rely on adhesives such as glue.

Twisted V heavy (approximately 3ooo/J/rf
T/M C)): Denisi display fineness of yarn)] 5ooo7frfT/M, which is the number of twists required to achieve a 1-strong twist effect without any breakage, preferably 120ookT/v
The twist density is much lower than the above-mentioned twist density, and therefore it has not been possible to provide a sufficiently high twisting result.

In order to eliminate the conventional drawbacks, the present inventors have grasped the phenomenon of alternating twist formation in intermittent false twisting and investigated the principle, and have found that However, by performing a special processing operation that changes the yarn feeding speed of the yarn with a higher yarn feeding speed among two or more supplied yarns with different yarn feeding speeds in response to intermittent false twisting, The present invention was achieved based on the finding that the twisting effect of twisting can be greatly enhanced, and that a winding configuration in which the sheath yarn is wound around the core yarn can pseudo-improve the strong twisting effect.

An object of the present invention is to provide a method for producing a highly twisted light-adjustable special composite yarn having an extremely high twisting effect.

In other words, the present invention provides a method for supplying thermoplastic multifilament yarns of two or more fibers at different yarn feeding speeds when false twisting the thermoplastic multifilament yarns of two or more fibers intermittently by repeatedly twisting and stopping the twisting. At the same time, in response to intermittent false twisting, the yarn with a higher yarn feeding speed is simultaneously increased in yarn twisting speed, and when the yarn twisting is stopped, the yarn is fed at a slower speed than during yarn twisting and false twisting is performed. The gist of this paper is a method for producing a highly twisted light-adjusting special composite yarn, which is characterized by subjecting it to the following steps.

The method of the present invention will be explained below based on illustrated examples.

The figure is a process schematic diagram showing an example of the method of the present invention, (
2) and (2 are yarn feeding devices, f3) are heating devices, (4)
(5) is a twisting device for applying intermittent false twisting, and (5) is a pulling device. The yarn (1) is fed by the yarn feeding device (2) and the yarn (one yarn is fed by the yarn feeding device (21), pulled together before the heating device (3), heated by the heating device (3), It passes through a twisting device (4) and is taken up by a pulling device (5).

In this case, yarn (1) and yarn (1) are both supplied in a supercharged state, but yarn (1) is supplied at a higher supercharging rate than that of yarn (1). , the yarn feeding speed is increased or decreased in response to the operation of the twisting device (4) which gives intermittent false twisting to the yarn.In other words, when twisting the yarn, the feeding speed of the yarn (1/) is increased, When the yarn twisting is stopped, the feeding speed is reduced within a range that does not become lower than the feeding speed of yarn (1).

Describing the twisting phenomenon when such a special processing operation is performed, first, the yarn (l) is twisted in the heating direction in the heating region during the operation of the twisting device ft (4).

(One thread passes through the twisting device (4) without being subjected to the untwisting action due to the stoppage of the twisting device (4), and the untwisted portion is formed.

While the twisting device (4) is not operating, the yarn (1) supplied to the heating area is reduced and the feeding speed is lower than when the twisting device (4) is in operation. Since the yarn is supplied at a higher supercharging rate than the yarn (one is wound around the yarn (υ), the yarn is wound by the propagation twist propagated from the untwisted portion.

The reason why the supply speed of yarn (1 thread) is reduced in response to the stoppage of the operation of the twisting device is due to the transient phenomenon of false twisting due to the intermittent drive of the twisting device and the transient phenomenon of false twisting due to fluctuations in the yarn feeding speed, as described later. This is because by synchronizing the phenomena, the alternating twist remains in the yarn at a much higher twist density as a synergistic effect.
Furthermore, due to the yarn stopping turning, the twist layer is lowered and the yarn (
Prevents yarn from being over-supplied at a high speed, causing sagging, wrapping around the rower, etc., causing yarn breakage, or inhibiting the yarn twisting action due to subsequent operation of the twisting device. It has the effect of stably processing.

Then, while the twisting device (4) is stopped, the yarn (1) is supplied to the heating region (one is given a strong twist by the operation of the twisting device (4), and at the same time the yarn (1) is twisted downstream of the twisting device (4)). The yarn is untwisted all at once in the untwisting area to form an untwisted part.The yarn is supplied to the heating area in response to the operation of the twisting device (4). Compared to when the twisting device i'j (4) is stopped, the twisting tension increases and becomes faster, but this reduces the twisting tension, increasing the winding of the yarn during heating and at the same time reducing the untwisting in the untwisting region. The action is carried out all at once up to the time of the take-off device I (5), making it possible to form a threaded part with a high twist density.

There is a sufficient reason why the twisting effect of alternate twisting can be greatly enhanced by changing the yarn feeding speed of the yarn on the high supercharging side, which has a higher yarn feeding speed, in response to twisting and stopping of the yarn. Although it is not clear yet, it is not only the effect of the increase in the amount of winding of the yarn in the heated area and the increase in the number of twists when the yarn feeding speed and degree are increased, but also the effect of intermittent false twisting in which the yarn twists and stops repeatedly. 9. By synergistically synergistically increasing the alternating twist-forming action by synchronizing the variable speed operation of the yarn feeding speed, it is possible to form alternating twists in the yarn without performing intermittent false twisting. Seem. In other words, the alternating twist formation phenomenon is a phenomenon in which the twist in the heating area is canceled out in the untwisting area downstream of the twisting device, but the twist that has not been completely canceled remains. It is thought that increasing the yarn feeding speed of the yarn on the high supercharging side in response to twisting makes it even more difficult for twist offset to occur.

On the other hand, the untwisted part that is formed when yarn twisting is stopped forms a twisted part in which one yarn is tightly wound in the heating area at the same time as the yarn twisting, and this twisted part is While sequentially transmitting the twist to the supply side, that! l: It is wound up and becomes a twisted part.

At this time, the yarn feeding speed of the yarn on the high supercharging side is decreased, but this is because the yarn feeding speed of the yarn on the high supercharging side increases during the subsequent yarn twisting action, and the yarn twisting is stabilized. 2.
It is created to make the wood's supply yarn a friend of the traditional twist.

The alternately twisted yarn produced by the method of the present invention has a form in which the core yarn, which is a low supercharging (+111 yarn), and the sheath yarn, which is a high supercharging side yarn, are tightly wound, compared to an alternately twisted yarn using a single thread. The stability of the alternating twist form due to the addition of tension is very good, and the texture is crisp due to the unevenness caused by the pitch interval of the wound yarn.Moreover, the fiber axis of the sheath yarn is far away from the R-axis direction of the core yarn. Because it has an inclined shape, it has mechanical properties different from those of normal twisted yarns. When made into a fabric, it has a heavy feel, 1° drapability, and elastic texture, and 1. It enhances the strong twist effect. It has a pseudo strong twist effect.

In the method of the present invention, it is necessary to feed two or more yarns at different yarn feeding speeds, and in order to sufficiently impart a strong twisting effect to the yarns, it is preferable that the yarns differ by 5% or more, particularly preferably. is to have a difference of 8% or more. If the difference in yarn feeding speed is less than 596, the sheath yarn will not wrap around the core yarn sufficiently and the two yarns will be aligned or close to it.
A pseudo strong twist effect may not be expected. It is preferable that the number of sheath yarns to be wound is as large as possible without changing the winding point at which the sheath yarn winds around the core yarn during yarn twisting. It should also be determined by taking into account the twisting time and stopping time.

Furthermore, in order to effectively exhibit the effects of the present invention.

It is preferable that the period during which the yarn feeding speed of the sheath yarn is changing is 2% or more. If this variation 11 is less than 2%, the variation may be too small to effectively enhance the alternating twist forming effect.

The manufacturing principle of the present invention is as described above.

As a specific manufacturing method, the false-twisting device used may be a normal mechanical spindle that rotates and stops, but from the viewpoint of durability and response performance, it is preferable to use a friction false-twisting device or a false-twisting device that uses air swirling flow. It is preferable to use In particular, when the yarn feeding speed is greatly increased in response to yarn twisting, in order to achieve stable machining, an air swirling flow is used which has the function of increasing the amount of yarn twisting by increasing the amount of supercharging. Preferably, a twisting device is used.

Furthermore, in the present invention, two or more yarns are fed at different yarn feeding speeds, and the yarn feeding speed of the yarn having a high yarn feeding speed is changed in accordance with twisting and stopping of the yarn. The yarn feeding speed of a yarn with a low yarn feeding speed may be changed in accordance with twisting and stopping of the yarn. However, in this case, the rate of increase in the yarn feeding speed during twisting of the yarn with a high yarn feeding speed must be greater than the rate of increase in the yarn feeding speed of the yarn with a low yarn feeding speed.

When sufficient winding wind of the sheath yarn is not obtained and the yarn twisting is stopped, the yarn feeding speed of the yarn whose yarn feeding speed is higher than that of the yarn whose yarn feeding speed is low is decreased. If the ratio is not higher, the entire supplied yarn or the yarn fed at a higher yarn feeding speed will become slack, causing winding around the loaf and causing yarn breakage or inhibiting the continued yarn twisting action. Only alternately twisted yarn with an extremely low degree of twist can be obtained.

As the yarn feeding device used in the present invention, a feeding loaf having a function of changing the rotational speed of the feeding loaf in response to twisting and stopping of a single yarn, or a passive yarn that rotates due to yarn running tension is used. The manufacturing principles of the present invention include the use of a yarn feeding device that changes the yarn feeding speed by changing the load resistance of the rotating body from light to nine heavy loads in response to the twisting and stopping of the yarn. Any material that satisfies the following may be used.

The yarn to be supplied in the present invention is polynisdel.

Stretched yarns, semi-drawn yarns, and undrawn yarns of thermoplastic synthetic fiber M-tifted yarns such as polyamide can be used, and furthermore, processed yarns subjected to crimping processing such as false twisting processing can also be used. . Usually these threads combine similar items, but their purpose.

Depending on the application, different types of supply systems may be used in combination, such as those with different polymers, different stretching conditions, or those with or without crimping.

In the above description, the case where two or more thermoplastic multifilaments are supplied by each supercharging nip is mainly shown, but the supply rate may be positive or negative.

In the method of the present invention, since the above-described configuration is adopted, it is possible to obtain a highly twisted composite yarn having an extremely high high twisting effect in which the sheath yarn is moderate in the core □ yarn. The yarn feeding speed of the yarn with a higher threading speed among two or more thermoplastic stiffening yarns is changed in response to intermittent false twisting, so that the untwisted portion and the untwisted portion are alternately twisted. can remain at a high density, increase the amount of winding of the sheath yarn and increase the number of twists, and also prevent the yarn from sagging and winding into a loaf during the production of composite yarn. It is possible to obtain a composite yarn with a strong twist tone.

The present invention will be specifically explained below using examples.

Example 1 Boriesde M filament 50D/24F (circular cross-section Pfit yarn 2 or less yarn A) and Lieste M filament 100D/36F' (circular cross-section Pfit yarn: l'J
, bobbin yarn B) are guided from the respective variable speed loafs to a false twisting zone consisting of a heating plate, a false twisting device, and a delivery loaf, and under the processing conditions of intermittent false twisting by air swirl flow shown in Table 1. A special composite system with a strong twist tone having the number of twists shown in Table 2 was obtained.

The fluid supply and stop times were set at random from 0.9 to 0.3 seconds according to commands from a microcomputer to which a random signal had been previously input.

Table 1 Table 2 This highly twisted light-adjusting special composite yarn is woven into a plain weave structure with a warp density of 78 wood/inch and a weft density of 66 wood/inch. When processed, a highly twisted woven fabric with crispness, drapability, and elasticity, which could never be obtained with conventional alternately twisted yarns, was obtained.

Example 2 Two pieces of polyester V filament 50D/24F (tight triangular cross-section yarn) were used, a feeder whose load could be electromagnetically varied was used as each yarn feeding device, a heating plate, a twisting device using an air swirl flow, the first Processing is carried out under the processing conditions of intermittent false twisting shown in Table 5 in a processing process consisting of a delivery row, a second heater that performs loosening sand heat treatment, a second delivery loaf, and a winding device, and the number of twists shown in Table 4 is Strongly twisted yarn! , 1 special special thread was obtained. The fluid supply and stop time were set according to commands from a microcomputer to which specific signals had been input in advance, and the fluid supply and stop times were set to 0.9 to 0.3 seconds.

Table 5 Table 4 The obtained strong twist light control special composite yarn was knitted into a Motsukumi-Lip fabric using 22 gauge double knits.
When dyed and finished, a highly twisted, light-toned knitted fabric, which was not seen with conventional alternately twisted yarns, was obtained.

[Brief explanation of the drawing]

The drawings are process schematic diagrams showing an example of the manufacturing method of the processing system of the present invention. (i), (t')...supply yarn, (21...constant speed supply roller. (2')...variable speed lobe, (3)...heater,
(4) --- False twisting device, (5) --- Buri Peri Rolla patent applicant Unitika Co., Ltd. B Product

Claims (2)

[Claims] (1) Two or more thermoplastic multifilament yarns are fed at different yarn feeding speeds when false twisting is performed intermittently by repeating twisting and stopping of twisting on thermoplastic multifilament yarns of two or more fibers. At the same time, the yarn with a higher yarn feeding speed is fed at a higher speed during yarn twisting in response to intermittent false twisting, and when yarn twisting is stopped, it is fed at a slower speed than during yarn twisting and false twisting is performed. A method for producing a highly twisted special composite yarn characterized by subjecting it to. (2) The two or more thermoplastic multifit yarns are fed at yarn feeding speeds that differ by 5% or more, and the yarn feeding speed is higher during yarn twisting and when yarn twisting is stopped. 2. The method for producing a highly twisted light-adjustable special composite yarn according to claim 1, wherein the false twisting is performed while the yarn tying speed changes by 2% or more.